JPH09195490A - Shock cushioning absorbing material and soundproof floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance soundproof performance by forming an integrated mold of solid elastomer having specific hardness and sponge elastomer having specific foaming power as a shock cushioning absorbing material to be arranged between a fixing surface and a surface member. SOLUTION: A shock cushioning absorbing material 2 is formed of a sheet- like member composed of an integrated mold of synthetic rubber whose hardness is 40 to 70, thermoplastic elastomer, solid elastomer 3 such as thermosetting elastomer, synthetic rubber whose foaming power is 50 to 500%, thermoplastic elastomer and sponge elastomer 4 such as thermosetting elastomer. A surface 2b of this shock cushioning absorbing material 2 is stuck to a ligneous floor material 5 or the like, and for example, it is formed as a soundproof floor material, and the reverse 2a of the shock cushioning absorbing material 2 is arranged on a slab 1. Therefore, the sock cushioning absorbing material excellent in impact noise level reducing performance, can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood soundproof floor material and the like which can be directly laid on a floor base finished with mortar, concrete or the like.

[0002]

2. Description of the Related Art Conventionally, a carpeted finish has been used for the floor of an apartment house or the like, but it is changing to a wooden floor due to the generation of mites and the difficulty of maintenance. However, the wooden floor has a big drawback that complaints from the downstairs are generated because the floor impact sound due to the walking noise on the floor and the sound of falling objects becomes loud.

Therefore, a wooden floor for direct application has been developed as a soundproof flooring material for alleviating floor impact noise. Specifically, a high-foam sheet or a fibrous material bonded to a wooden floor is known.

[0004]

However, in such a conventional directly laminated wood-based soundproof flooring material, the shock absorbing and absorbing material is made of a highly foamed sheet or a fibrous composition, but is compressed through the flooring material for a long period of time. Since the load is applied, the compression set becomes large. As a result, the floor material becomes dented or dented, the finish of the floor material is impaired, and steps are generated.
Dangers such as tripping during walking occur, and the amount of floor impact sound level improvement decreases, impairing the original performance of soundproof flooring.

An object of the present invention is to reduce the compression set even when stress is applied to a shock absorbing material which constitutes a soundproof flooring or the like for a long period of time, and particularly shock absorbing and absorbing performance. It is to improve the soundproof performance.

[0006]

The present inventor has made diligent efforts to solve the problems in the conventional direct-bonding wood-based soundproof flooring, and as a result, the productivity is excellent, the cost is low, and the compression set is low. The present invention has resulted in a shock-absorbing absorber that is small in amount and excellent in the impact noise level reducing performance, and a sound-proof flooring material using the same.

The present invention is a shock-absorbing and absorbing material to be installed between a fixed surface and a surface-side member, which is an integrally molded product of sponge elastomer and solid elastomer,
The hardness of the solid elastomer is 40 or more and 70 or less, and the expansion ratio of the sponge elastomer is 50% or more, 5
The present invention relates to a shock absorbing and absorbing material, which is characterized by having a content of 100% or less.

Further, according to the present invention, the shock absorbing and absorbing material is composed of a sheet-shaped member in which the solid elastomer and the sponge elastomer are laminated, and the back surface side concave portion and the back surface side projection are regularly formed on the back surface side of the sheet shaped portion. Are arranged in a line, and front surface side projections are formed on the front surface side of the shock absorbing material at positions corresponding to the rear surface side recesses, and at front surface sides of the shock absorbing material at positions corresponding to the back surface side projections. The present invention relates to a shock absorbing material, wherein front surface side recesses are formed and each front surface side projection is formed with a flat surface to be brought into contact with the front surface side member.

Furthermore, the present invention relates to a soundproof flooring material, characterized in that it comprises the above-mentioned shock absorbing and absorbing material and a surface flooring material joined to this shock absorbing and absorbing material. .

The inventor of the present invention has conducted research to produce a shock absorbing absorber and a soundproof flooring material having a simple structure, capable of reducing the compression strain, and excellent in soundproofing performance. In the process, it was conceived to integrally mold the solid elastomer and sponge elastomer as described above.

A more specific description will be given. Examples of the solid elastomer include natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, ethylene propylene rubber, acrylonitrile butadiene rubber, isoprene rubber, butyl rubber, chlorosulfonated polyethylene rubber, urethane rubber, and other synthetic rubbers: thermoplastic elastomers. : Examples include thermosetting elastomers. These can be used alone or in combination of two or more. If necessary, a cross-linking agent, a filler, an antioxidant, a processing aid, a softening agent, a plasticizer, a cross-linking aid, a coloring agent, a tackifier and the like can be mixed and used.

As the sponge elastomer, synthetic rubber such as natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, ethylene propylene rubber, acrylonitrile butadiene rubber, isoprene rubber, butyl rubber, chlorosulfonated polyethylene rubber, urethane rubber: thermoplastic elastomer : Examples include thermosetting elastomers. These can be used alone or 2
More than one species can be used in combination. If necessary, mix and use a cross-linking agent, a foaming agent, a foaming auxiliary agent, a filler, an antioxidant, a processing auxiliary agent, a softening agent, a plasticizer, a cross-linking auxiliary agent, a coloring agent, a tackifier, etc. You can

The expansion ratio of sponge elastomer is 50
Design to be ~ 500%. When the expansion ratio is less than 50%, when the sponge elastomer is integrally molded with the solid elastomer, the moldability is sufficient, but the desired floor impact sound level is not sufficiently improved. From this point of view, the expansion ratio of the sponge elastomer is 100
% Or more is more preferable.

Further, when the expansion ratio exceeds 500%, when integrally molding with a desired solid elastomer,
Dimensional stability is likely to decrease and compressive deformation due to load is likely to occur. From this viewpoint, it is more preferable that the foaming ratio of the sponge elastomer is 400% or less.

The solid elastomer has a hardness of
4 when measured with a rubber hardness tester "JIS-A type"
It shall be adjusted in the range of 0 to 70. If the hardness is less than 40, the compression characteristics of the shock absorbing material will be significantly deteriorated. If the hardness exceeds 70, the hardness is too high, and the effect of reducing the floor impact sound level of the shock absorbing material is small.

When producing the integrally molded article of the sponge elastomer and the solid elastomer, the corresponding compositions can be mixed and molded by using the conventional manufacturing method. That is, as a mixing method, there is a method of mixing using an open roll, a Banbury mixer, a closed mixer such as an internal mixer pressure kneader, or the like. By laminating the layer of the solid elastomer composition and the layer of the sponge elastomer composition by an open roll, a calendar roll, a roller bed extruder, a multi-layer extruder, etc., and using a press device, a rotocure device or a continuous extrusion vulcanization device. And can be integrally vulcanized and molded.

The shock absorbing and absorbing material of the present invention is most preferably applied to a floor material, but it can be used for other purposes, for example, as a soundproof wall material. In this case, the "front surface side member" is a surface wall material, usually a decorative wall material. When the shock absorbing material of the present invention is applied to a soundproof flooring material, the shock absorbing material is laid on the fixed surface (usually concrete or mortar slab),
Bond the shock absorber to the surface floor. A wooden floor material is particularly suitable as the surface floor material.

In the thus-obtained direct-bonding wooden soundproof flooring material, the thickness of the wooden flooring material is 9 to 12 in consideration of maintenance such as replacement of carpets.
The thickness of the buffer absorbent is preferably 5 to 7 m
m is preferable. In addition, the wooden floor material is provided with a saw groove on the back side of the wooden floor material in the longitudinal direction in order to improve the soundproofing performance and prevent the wooden floor material from warping as long as the strength of the floor material is not impaired. Can be applied at any interval such as 10 mm pitch to 50 mm pitch in the lateral direction.

By using the shock absorbing / absorbing material obtained by such a manufacturing method, it is possible to provide a direct-bonding wood-based soundproof flooring material having a high effect of improving the floor impact sound level.

FIG. 1 is a sectional view of a part of a direct-bonding wooden soundproof flooring material according to one embodiment of the present invention. A soundproof floor material is laid on the surface 1a of the slab 1. Soundproof flooring,
It is manufactured by bonding the shock absorbing material 2 and the wooden floor material 5. The shock absorbing / absorbing material 2 is a sheet-shaped member formed by integrally molding a solid elastomer 3 and a sponge elastomer 4. The back surface 2 a of the shock absorbing / absorbing material 2 is installed on the slab 1. The surface 2b of the shock absorbing / absorbing material 2 is attached to the wooden floor material 5.

FIG. 2A is a sectional view showing a part of the shock absorbing material 6 according to another embodiment of the present invention.
FIG. 2B is a top view showing the front surface side of the shock absorbing material 6, FIG. 2C is a bottom view showing a part of the shock absorbing material 6, and FIG. 3 is this shock absorbing material. It is a partial cross section figure which shows the state which installed the direct-bonding wooden soundproofing floor material which used No. 6 on the slab.

The shock absorbing / absorbing material 6 is composed of a sheet-like member in which a solid elastomer 7 and a sponge elastomer 8 are laminated. On the back side of this sheet-like member, back side recesses 7a and back side projections 7b are regularly arranged. The back surface side protrusion 7b directly contacts the front surface 1a of the slab 1. In this state, the voids 10 formed by the back surface side recessed portions 7a each have a substantially quadrangular pyramid shape. A front surface side protrusion 8 a is formed on the front surface side of the shock absorbing / absorbing material 6. Each front surface side protrusion 8a is formed at a position corresponding to the back surface side recessed portion 7a when seen in a plan view.

Further, on the front surface side of the shock absorbing material 6, a front surface side concave portion 8b is formed between the front surface side projections 8a. Each front surface side recessed portion 8b is formed at a position corresponding to the back surface side protrusion 7b when viewed two-dimensionally. Each of the front surface side projections 8a is formed with a flat surface 8c to be brought into contact with the wooden floor material 12. In the case of the direct-bonding wood-based soundproof floor material of FIG. 3, each flat surface 8c of each front-side protrusion 8a
On the other hand, the wooden floor material 12 is attached, and as a result, a space 11 is formed between the wooden floor material 12 and the shock absorbing material 6 by the front surface side concave portion 8b. 13 is
This is a saw groove processing part.

When an impact is applied to the wooden flooring material 12, this impact propagates through each projection 8a, then through the sheet-like layers 7 and 8 in a substantially horizontal direction, and finally each projection 7b.
To the slab. In this process, the shock is once buffered by the projection 8a made of sponge elastomer and then attenuated by the deformation of the sheet-shaped layers 7 and 8, so that the shock to the slab is remarkably reduced.

[0025]

EXAMPLES Each compound shown in Table 1 and Table 2 was obtained, and each compound was uniformly dispersed at 60 ° C. using a “10-J” open roll to obtain a green sheet made of each rubber composition. Obtained. A green sheet made of each rubber composition was placed in a mold and press-molded at 160 ° C. for 10 minutes to obtain each crosslinked rubber. The hardness or foaming ratio of each of the obtained crosslinked rubbers was measured. The hardness and the expansion ratio (specific gravity) were measured according to "JIS-K-6301 rubber test method". The results are shown in Tables 1 and 2.

[0026]

[Table 1]

[0027]

[Table 2]

Then, a raw sheet made of each compound shown in Examples and Comparative Examples was produced, and the raw sheets were laminated to produce a laminate, and the laminates of Examples and Comparative Examples were each placed in a mold. Then, by press-molding at 160 ° C. for 10 minutes, shock-absorbing absorbers made of a sponge elastomer sheet and a solid elastomer sheet, which were integrally molded, were obtained. Moldability was evaluated for each shock absorbing material.

As a result, in Examples 1 and 4 and Comparative Example 1, the dimensional stability during integral molding was high and the shape retention was also good. In Examples 2 and 3, dimensional stability and shape retention during integral molding were particularly good. On the other hand, in Comparative Examples 2 and 3, since the expansion ratio of the sponge elastomer composition was 600%, the expandability of the sponge elastomer was significantly different from that of the solid elastomer composition, and it was difficult to maintain the shape of the mold. The dimensional stability was lost, and the shock absorbing absorber was warped.

Using the formulations of the examples and comparative examples shown in Tables 1 and 2, the shock-absorbing absorber and the soundproof flooring shown in FIGS. 2 and 3 were produced. The shape of the shock absorbing / absorbing material shown in FIG. 2 is obtained by forming corresponding irregularities on the inner surface of the mold. Also, the temperature during breath molding is 16
The temperature was 0 ° C. and the time was 10 minutes. Each shock-absorbing absorber was attached to the back side of a decorative plywood having a thickness of 9 mm to produce a soundproof flooring material, and the soundproofing floor material was laid on a concrete slab having a thickness of 150 mm. With respect to this soundproof floor structure, lightweight floor impact sound level measurement was performed according to "JIS-A-1418 Floor impact sound level measurement method". Table 3 shows the results. Also, a person weighing 60 kg was allowed to walk on this soundproof floor structure, and the sensation during walking was investigated.

[0031]

[Table 3]

In Examples 1, 2, 3, and 4, the lightweight floor impact sound level was remarkably reduced in all frequency regions as compared with the comparative example, and the average floor impact sound level was about _LL- 40. The soundproofing performance was very good. In Comparative Examples 1, 2, and 3, the floor impact sound level is about _LL −.
It was about 45, and a difference of one rank was recognized.

In the first, second, third, and fourth embodiments,
The feeling when walking was good. On the other hand, Comparative Example 1
Then, I felt a slight shock when walking. Comparative Examples 2 and 3
Then, when walking on the floor material, it was found that it was difficult to walk because the dent of the floor material occurred.

[0034]

As described above, since the shock absorbing and absorbing material of the present invention is excellent in stability at the time of molding and productivity and is excellent in the effect of improving the floor impact sound level, it is particularly gathered. When considering the soundproof floor of a house, it can be said that it is the most suitable material when considering the cost performance of a direct-bonding wooden soundproof floor material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a soundproof flooring using a shock absorbing / absorbing material according to an embodiment of the present invention.

FIG. 2 (a) is a cross-sectional view showing a part of a shock absorbing material according to another embodiment of the present invention, and FIG. 2 (b) is (a).
It is a top view of the shock-absorbing absorber of FIG. 3, (c) is a bottom view of the shock-absorbing absorber of (a).

FIG. 3 is a cross-sectional view showing a state in which a soundproof floor material using the shock absorbing and absorbing material of FIG. 2 (a) is laid on a slab.

[Explanation of symbols]

 1 Slab 2, 6 Shock Absorbing Absorber 3, 7 Solid Elastomer 4, 8 Sponge Elastomer 5, 12 Wood Floor Material 7a Back Side Recess 7b Back Side Projection 8a Surface Side Projection 8b Surface Side Recess 10, 11 Void

Claims (3)

[Claims] 1. A shock absorbing and absorbing material to be installed between a fixed surface and a surface side member, which is an integrally molded product of a sponge elastomer and a solid elastomer, wherein the solid elastomer has a hardness of 40 or more and 70 or less. And
The expansion ratio of the sponge elastomer is 50% or more, 5
A shock-absorbing absorber, characterized in that it is at most 00%. 2. The shock-absorbing and absorbing material is made of a sheet-shaped member in which the solid elastomer and the sponge elastomer are laminated, and the back-side recesses and the back-side protrusions are regularly arranged on the back side of the sheet-shaped member. And a front surface side projection is formed on the front surface side of the shock absorbing material at a position corresponding to the rear surface side concave portion, and a position corresponding to the back surface side projection on the front surface side of the shock absorbing material. 2. The shock absorbing material according to claim 1, wherein a front surface side concave portion is formed in each of the front surface side projections and a flat surface to be in contact with the front surface side member is formed in each of the front surface side projections. 3. A soundproof flooring material comprising the shock absorbing material according to claim 1 or 2, and a surface floor material joined to the shock absorbing material.